#!/bin/bash
#

NIC=ens33
while true; do
  OLD_IN=$(awk '$0~"'$NIC'" {print $2}' /proc/net/dev)
  OLD_OUT=$(awk '$0~"'$NIC'" {print $10}' /proc/net/dev)
  sleep 1
  NEW_IN=$(awk '$0~"'$NIC'" {print $2}' /proc/net/dev)
  NEW_OUT=$(awk '$0~"'$NIC'" {print $10}' /proc/net/dev)

  IN=$(printf "%.1f%s" "$((($NEW_IN-$OLD_IN)/1024))" "KB/s")
  OUT=$(printf "%.1f%s" "$((($NEW_OUT-$OLD_OUT)/1024))" "KB/s")

  clear
  echo " In     Out"
  echo "$IN $OUT"
  sleep 1
done
